window (redirected from Window-sill)

window /win·dow/ (win´do)

1. a circumscribed opening in a plane surface.

2. the voltage limits that determine which pulses will be allowed to pass on.

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aortic window  a transparent region below the aortic arch, formed by the bifurcation of the trachea, visible in the left anterior oblique radiograph of the heart and great vessels.

oval window  fenestra vestibuli.

round window  fenestra cochleae.

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win·dow (wnd)

n.

A fenestra.

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window

a circumscribed opening in a plane surface.

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cochlear window, fenestra cochleae

an aperture between the tympanic cavity of the middle ear and the cochlea of the internal ear; covered by the secondary tympanic membrane. Called also round window.

oval window

an oval opening in the inner wall of the middle ear, which is closed by the stapes; called also fenestra vestibuli.

round window

see cochlear window (above).